Information about the signing was first reported by Reuters and ESPN.
According to ESPN.com, the signing is for a veteran's league minimum.
Last season in the playoffs with the Miami Heat, Lewis started in eight games but averaged a mere 4.5 points per game during the regular season while shooting 41.5 percent from the field and 34.3 percent from beyond the arc (averaging 16.2 minutes per game).
However, Lewis has been a solid player for many years in the NBA, and will be an added bonus for a Mavericks team currently loaded with depth and talent.
In his 16-year career with three different teams (Seattle, Orlando, and Miami), Lewis has averaged 14.9 points per game.
Although Lewis, 34, is no longer considered an elite starter in the league, the forward should fit nicely into Dallas' system as another three-point threat.
Lewis will be joining a Dallas team anchored by Dirk Nowitzki, Monta Ellis, and newcomer Chandler Parsons.
Parsons recently signed a three-year deal with the Mavericks, as the Rockets failed to match Dallas' offer on the restricted free agent forward.
According to reports on ESPN.com, Richard Jefferson is also expected to sign a league minimum contract with the Mavericks -- adding yet another perimeter shooter to Dallas' team.
In addition, the Mavericks still have an additional $2.7 million exception to use as well.
Dallas is also planning to re-sign Bernard James to the team.
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Denton Ramsey may be reached via email at TXSWReport@gmail.com